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We propose the first practical method to detect atmospheric tau neutrinoappearance at sub-GeV energies, which would be an important test of $\nu_\mu\rightarrow \nu_\tau$ oscillations and of new-physics scenarios. In theJiangmen Underground Neutrino Observatory (JUNO; starts in 2024), active-flavorneutrinos eject neutrons from carbon via neutral-current quasielasticscattering. This produces a two-part signal: the prompt part is caused by thescattering of the neutron in the scintillator, and the delayed part by itsradiative capture. Such events have been observed in KamLAND, but only in smallnumbers and were treated as a background. With $\nu_\mu \rightarrow \nu_\tau$oscillations, JUNO should measure a clean sample of 55 events/yr; with simple$\nu_\mu$ disappearance, this would instead be 41 events/yr, where the latteris determined from Super-Kamiokande charged-current measurements at similarneutrino energies. Implementing this method will require precise laboratorymeasurements of neutrino-nucleus cross sections or other developments. Withthose, JUNO will have $5\sigma$ sensitivity to tau-neutrino appearance in 5years exposure, and likely sooner.

New Signal of Atmospheric Tau Neutrino Appearance: Sub-GeV Neutral-Current Interactions in JUNO